The "No Child Left Behind Act (NCLB) of 2001" requires all schools, districts/local education agencies (LEAs) and states to show that students are making Adequate Yearly Progress (AYP). NCLB requires states to establish targets in the following ways: (1) Annual Proficiency Target; (2) Attendance/Graduation Rates; and (3) Participation Rates. Missouri's AYP targets were established by the Missouri Department of Elementary and Secondary Education based on a formula from the NCLB Act and an analysis of Missouri Assessment Program (MAP) data, attendance rate data and graduation rate data from prior years. When all targets are met, the requirements of AYP are met. Beginning with the 2008-2009 AYP determinations, Missouri was approved to implement a growth model for use in determining AYP. Growth model calculations were applied to 2006-2007, 2007-2008, 2008-2009, 2009-2010, and 2010-11 grade-level MAP and MAP-A data. Missouri uses the following steps in evaluating AYP at the school, district/LEA, and state levels: (1) Participation Rate; (2) Cell Size; (3) Annual Proficiency Target Indicator; (4) Additional Indicators; (5) Confidence Interval; (6) Growth; (7) Safe Harbor; and (8) Safe Harbor Confidence Interval.